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Medium, CVSS 6.5amended

OpenList: Authenticated arbitrary file write via Content-Disposition path traversal in SimpleHttp offline-download tool

CVE-2026-75602GHSA-h6cj-26g5-67fv

What to do

Partial vendor fix. Follow the primary source's mitigation guidance and check back for a fix.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

  • Go github.com/OpenListTeam/OpenList

    Affected
    <= 4.2.2
    Fixed in
    4.2.3

  • Go github.com/OpenListTeam/OpenList/v3

    Affected
    every version
    Fixed in
    no fixed version recorded

  • Go github.com/OpenListTeam/OpenList/v4

    Affected
    < 4.2.3
    Fixed in
    4.2.3

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
6.5 · CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H
EPSS
  • CVE-2026-75602: 0.69% estimated exploitation activity in the next 30 days; percentile 52.99 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

Summary Alist's offline-download feature (POST /api/fs/addofflinedownload with tool: "SimpleHttp") accepts an attacker-supplied URL, fetches it, and saves the bytes under a per-task temp directory before transferring to the user's destination storage. The temp filename is taken from the response's Content-Disposition header (attacker-controlled when the URL points to an attacker HTTP server), passed verbatim to filepath.Join(tempDir, filename), and written via os.Create with no containment check. Go's filepath.Join calls Clean on the result, which collapses .. segments and lets the attacker traverse out of tempDir to write any file the alist process can write. A non-admin user with PermAddOfflineDownload permission on any path is sufficient. Affected code internal/offlinedownload/http/util.go — filename returned verbatim from header: internal/offlinedownload/http/client.go (SimpleHttp.Run): server/handles/offlinedownload.go (AddOfflineDownload) is mounted under normal user auth (not…

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 3 · amended ·

    Amended from ghsa record GHSA-h6cj-26g5-67fv

  2. Revision 2 · amended ·

    Amended from osv record GO-2026-6368

  3. Revision 1 · created ·

    Published from osv record GHSA-h6cj-26g5-67fv

Agent brief

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# Patch Next advisory brief: CVE-2026-75602

Advisory: OpenList: Authenticated arbitrary file write via Content-Disposition path traversal in SimpleHttp offline-download tool
IDs: CVE-2026-75602, GHSA-h6cj-26g5-67fv
Record: https://patchnext.com/advisories/cve-2026-75602 (revision 3, source checked 26 Oct 2026, 15:29 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 6.5)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Partial vendor fix; fixed versions by package: github.com/OpenListTeam/OpenList 4.2.3; github.com/OpenListTeam/OpenList/v4 4.2.3. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go github.com/OpenListTeam/OpenList: affected <= 4.2.2; fixed in 4.2.3
- Go github.com/OpenListTeam/OpenList/v3: affected every version
- Go github.com/OpenListTeam/OpenList/v4: affected < 4.2.3; fixed in 4.2.3

## Suggested inspection (read-only)
- Go github.com/OpenListTeam/OpenList: check the installed version with your package manager.
- Go github.com/OpenListTeam/OpenList/v3: check the installed version with your package manager.
- Go github.com/OpenListTeam/OpenList/v4: check the installed version with your package manager.

## Supported action
No complete vendor fix is recorded. Follow the primary source's mitigation guidance and check this record again before closing anything.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on github.com/OpenListTeam/OpenList, github.com/OpenListTeam/OpenList/v3, github.com/OpenListTeam/OpenList/v4.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-h6cj-26g5-67fv (OSV record GHSA-h6cj-26g5-67fv lists affected ranges: Go github.com/OpenListTeam/OpenList >=0 <4.2.3 (fixed))
- Verified: https://osv.dev/vulnerability/GO-2026-6368 (OSV record GO-2026-6368 lists affected ranges: Go github.com/OpenListTeam/OpenList >=0; Go github.com/OpenListTeam/OpenList/v3 >=0; Go github.com/OpenListTeam/OpenList/v4 >=0 <4.2.3 (fixed))
- Verified: https://github.com/advisories/GHSA-h6cj-26g5-67fv (GitHub-reviewed advisory GHSA-h6cj-26g5-67fv lists affected ranges: Go github.com/OpenListTeam/OpenList >=0 <=4.2.2)

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